Summary of Financial Information for Reportable Segments (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Revenues	$ 57,211,431	$ 53,206,174	$ 51,981,800	$ 48,743,121	$ 45,052,839	$ 46,688,925	$ 46,423,929	$ 42,733,478	$ 211,142,526	$ 180,899,171	$ 161,533,859
Revenues	54,433,040	50,197,700	49,042,468	45,711,804	42,288,106	43,850,010	43,783,252	40,355,066	199,385,012	170,276,434	155,175,664
Costs & expenses									161,432,224	137,492,611	127,458,921
Amortization of acquisition-related intangible assets		52,054	80,769	80,769	80,769	80,769	80,769	80,769	213,592	323,076	323,076
Depreciation & amortization	2,069,118	1,605,553	1,319,701	1,310,568	1,214,324	1,167,347	1,109,318	1,084,423	6,304,940	4,575,412	4,353,748
Operating income	12,386,787	10,456,160	10,640,661	9,708,162	9,620,512	10,979,966	9,442,917	8,464,677	43,191,770	38,508,072	29,398,114
Revenues	2,778,391	3,008,474	2,939,332	3,031,317	2,764,733	2,838,915	2,640,677	2,378,412	11,757,514	10,622,737	6,358,195
Outsourced Portals
Segment Reporting Information [Line Items]
Costs & expenses									132,529,640	110,994,019	101,557,474
Amortization of acquisition-related intangible assets									213,592	323,076	323,076
Depreciation & amortization									6,011,522	4,248,874	3,951,458
Operating income									60,630,258	54,710,465	49,343,656
Other Software & Services
Segment Reporting Information [Line Items]
Costs & expenses									4,397,608	4,362,317	4,225,426
Depreciation & amortization									60,557	58,108	80,743
Operating income									7,299,349	6,202,312	2,052,026
Other Reconciling Items
Segment Reporting Information [Line Items]
Costs & expenses									24,504,976	22,136,275	21,676,021
Depreciation & amortization									232,861	268,430	321,547
Operating income									$ (24,737,837)	$ (22,404,705)	$ (21,997,568)